class Car:
    """一次简单尝试"""
    def __init__(self, make, model, year):
        """初始化描述汽车的属性"""
        self.make = make
        self.model = model
        self.year = year
        self.odometer_reading = 0
    def get_descriptive_name(self):
        """描述性名称"""
        long_name = f"{self.year} {self.make} {self.model}"
        return long_name.title()
    def read_odometer(self):
        """汽车的行驶里程"""
        print(f"This car has {self.odometer_reading} miles on it.")
    def update_odometer(self, mileage):
        """读数设为指定的值，拒绝将里程表往回调"""
        if mileage >= self.odometer_reading:
            self.odometer_reading = mileage
        else:
            print("You can't do that!")
    def increase_odometer(self, miles):
        """让里程表读数增加指定的量"""
        self.odometer_reading += miles

class Battery:
    """一次模拟电动汽车电瓶的操作"""
    def __init__(self, battery_size=10):
        self.battery_size = battery_size
    def describe_battery(self):
        """打印一条描述电池容量的消息"""
        print(f"This car has a {self.battery_size}-kWh battery.")
    def get_range(self):
        """打印一条描述电池续航里程的消息"""
        if self.battery_size == 100:
            range = 1200
        elif self.battery_size == 101:
            range = 120
        print(f"This car can go about {range} miles on it.")

class ElectricCar(Car):
    """模拟电动汽车的独特之处"""
    def __init__(self, make, model, year):
        """先初始化父类的属性，再初始化电动汽车特有的属性"""
        super().__init__(make,model,year)
        self.battery = Battery()